[App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking

Wed Jun 7 20:56:58 UTC 2017

That is correct. Unfortunately the Leo Bodnar unit doesn't provide that.

On Wed, Jun 7, 2017 at 2:44 PM, Pierre Martel <petem001 at gmail.com> wrote:

> So It would be good, now from what Info I have, I will still need another
> gps for the nmea and 1 pps to feed the rtcm?
>
>
> Le mer. 7 juin 2017 à 03:46, Joe Moskalski <kc2irv at gmail.com> a écrit :
>
>> I purchased one of those units about 2 months ago and they work extremely
>> well. I have used it to allow the use of Motorola Maxtrac's and GM300's for
>> simulcast operation by externally injecting a 14.4 MHz reference into the
>> radio from this unit.
>> if you want a ready-made solution that will give you GPS locked accuracy
>> and is programmable to just about any frequency you would need than this is
>> it.
>>
>> On Tue, Jun 6, 2017 at 5:00 PM, Pierre Martel <petem001 at gmail.com> wrote:
>>
>>> after reading on gps locked clock and  pll found this.
>>> http://www.leobodnar.com/shop/index.php?main_page=product_
>>> info&cPath=107&products_id=234
>>>
>>> Low-jitter GPS-locked precision frequency reference
>>> 450 Hz to 800 MHz output
>>>
>>> this could be usefull to steer about any radio model no?
>>>
>>> Is it worth the time and money to try with this device?
>>>
>>> Le ven. 12 mai 2017 à 17:39, Pierre Martel <petem001 at gmail.com> a
>>> écrit :
>>>
>>>> A big thanks Tim. I feel less uneducated ;-) Will have to get a look at
>>>> this..
>>>>
>>>> 2017-05-12 12:03 GMT-04:00 Tim Sawyer <tisawyer at gmail.com>:
>>>>
>>>>> Political Correctness Gone Mad. 😄
>>>>>
>>>>> Actually it's Programmable Clock Generator Module.
>>>>>
>>>>> K
>>>>>
>>>>> On Thu, May 11, 2017 at 8:38 PM Pierre Martel <petem001 at gmail.com>
>>>>> wrote:
>>>>>
>>>>>> I know there is always the one that ask the obvious question but,
>>>>>> what is a pcgm?
>>>>>>
>>>>>>
>>>>>> Le lun. 8 mai 2017 à 23:10, Tim Sawyer <tisawyer at gmail.com> a écrit :
>>>>>>
>>>>>>> The PCGM were noisy. I know of a case where a ham using one was shut
>>>>>>> down by the site owner. Seems the PCGM was emitting a interfering signal on
>>>>>>> high band, around 158 Mhz.
>>>>>>>
>>>>>>> On Mon, May 8, 2017 at 1:33 PM, Bryan Fields <bryan at bryanfields.net>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> I've been following this with some interest.  One of the
>>>>>>>> fundamental issues with the PCGM was the master clock going to the radio
>>>>>>>> was unable to be modulated.  This made low frequency signals (PL) distort,
>>>>>>>> and digital PL was even worse.
>>>>>>>>
>>>>>>>> Typically most radios use two point modulation, with modulation on
>>>>>>>> the reference oscillator.  When you add an external reference you loose
>>>>>>>> this.
>>>>>>>>
>>>>>>>> Some base stations are designed to do two point modulation even on
>>>>>>>> an external clock, the Quantar for example.  This station will even phase
>>>>>>>> lock it's PL and DPL generation if provided a 1 PPS in addition to a clock.
>>>>>>>>
>>>>>>>> If we could inject modulation into the clock generator simulcast
>>>>>>>> performance would vastly improve.  I'd be interested to see your design to
>>>>>>>> see if this would be a possibility.
>>>>>>>>
>>>>>>>> Thoughts?
>>>>>>>>
>>>>>>>> --
>>>>>>>> Bryan Fields
>>>>>>>> M: +1-727-409-1194 <(727)%20409-1194>
>>>>>>>>
>>>>>>>> On May 8, 2017, at 14:15, Reid Brandon <rfpowerguy at yahoo.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>> Hi Joe,
>>>>>>>> I got a page with a pic of a man that rotated  around saying
>>>>>>>> DOWNLOAD NOT FOUND.
>>>>>>>> Try again!?
>>>>>>>> Tks  Reid
>>>>>>>>
>>>>>>>>
>>>>>>>> On Sunday, May 7, 2017 12:25 PM, Pierre Martel <petem001 at gmail.com>
>>>>>>>> wrote:
>>>>>>>>
>>>>>>>>
>>>>>>>> I am very interrested in all this project. My email is VE2PF @
>>>>>>>> VE2MRC dot com!
>>>>>>>>
>>>>>>>> what radio did you used for the project?
>>>>>>>>
>>>>>>>> Thanks for sharing!
>>>>>>>>
>>>>>>>> Pierre
>>>>>>>> VE2PF
>>>>>>>>
>>>>>>>>
>>>>>>>> 2017-05-07 12:32 GMT-04:00 Kevin Custer <kuggie at kuggie.com>:
>>>>>>>>
>>>>>>>> Joe,
>>>>>>>>
>>>>>>>> Why not consider do it as an article for Repeater Builder?
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Kevin
>>>>>>>>
>>>>>>>>
>>>>>>>> On 5/7/2017 3:13 AM, Joe Moskalski wrote:
>>>>>>>>
>>>>>>>> I wanted to throw this email out to the group for all those who
>>>>>>>> want to simulcast with the RTCM. For those who don't know, in order to make
>>>>>>>> the RTCM suitable for simulcast you must have a more accurate 9.6 MHz clock
>>>>>>>> for the RTCM in order to ensure the audio sounds acceptable in the overlap
>>>>>>>> areas. I did this a few months ago using 9.6 MHz OCXO's. This worked
>>>>>>>> reasonably well. Not as well as I would have liked but the system was very
>>>>>>>> usable, but of course I wanted it to be better. Since the PCGM
>>>>>>>> (Programmable Clock Generation Module) is no longer available, I decided to
>>>>>>>> roll my own as some say.
>>>>>>>> I created a PLL circuit that can accept a 10 MHz, 1 MHz or 100 KHz
>>>>>>>> reference input and produce a phase locked 9.6 MHz out for the RTCM. I have
>>>>>>>> been testing this over the past few days and it has made an great
>>>>>>>> improvement in the audio quality in the overlap. The quality of the audio
>>>>>>>> in the overlap areas sounds very, very good, it's very similar to what I
>>>>>>>> expect to hear in commercial simulcast systems. My circuit is heavily based
>>>>>>>> off of an old Motorola MSF5000 HSO PLL circuit that I was able to adapt and
>>>>>>>> modify to my needs.  There are other uses for this circuit that make it
>>>>>>>> attractive for simulcasting but I wont get into them here. I am will to
>>>>>>>> share my schematic and bill of materials (digikey) with anyone. Please send
>>>>>>>> me an email and I will be willing to share all of my information on the
>>>>>>>> project.
>>>>>>>>
>>>>>>>>
>>>>>>>> ______________________________ _________________
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>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> --
>>>>>>> Tim
>>>>>>> _______________________________________________
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>>>>>
>>>>> --
>>>>> --
>>>>> Tim
>>>>>
>>>>> _______________________________________________
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